MV Empire MacMahon was an oil tanker

Oil tanker

An oil tanker, also known as a petroleum tanker, is a merchant ship designed for the bulk transport of oil. There are two basic types of oil tankers: the crude tanker and the product tanker. Crude tankers move large quantities of unrefined crude oil from its point of extraction to refineries...

 converted to a merchant aircraft carrier

Merchant aircraft carrier

Merchant aircraft carriers were bulk cargo ships with minimal aircraft handling facilities, used during World War II by Britain and the Netherlands as an interim measure to supplement British and United States-built escort carriers in providing an anti-submarine function for convoys...

 or MAC ship.

MV Empire MacMahon was built by Swan Hunter, Wallsend

Wallsend

Wallsend is an area in North Tyneside, Tyne and Wear, England. Wallsend derives its name as the location of the end of Hadrian's Wall. It has a population of 42,842.-Romans:...

 under order from the Ministry of War Transport. She entered service as a MAC ship in December 1943, however only her air crew and the necessary maintenance staff were naval personnel. She was operated by Anglo-Saxon Petroleum Co.

She returned to merchant service as an oil tanker in 1946 and renamed Naninia and was eventually scrapped in Hong Kong

Hong Kong

Hong Kong is one of two Special Administrative Regions of the People's Republic of China , the other being Macau. A city-state situated on China's south coast and enclosed by the Pearl River Delta and South China Sea, it is renowned for its expansive skyline and deep natural harbour...

in 1960.